linux-kernel - [PATCH v11 2/3] dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property

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Date:   Wed, 16 Feb 2022 19:31:30 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        "Tinghan Shen" <tinghan.shen@...iatek.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sean Wang <sean.wang@...iatek.com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <ryder.lee@...nel.org>, <wenst@...omium.org>,
        <chunfeng.yun@...iatek.com>
Subject: [PATCH v11 2/3] dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property

Extend driving support for I2C pins on SoC mt8195.
This property is already documented in mediatek,mt8183-pinctrl.yaml.

Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../bindings/pinctrl/pinctrl-mt8195.yaml      | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
index 8299662c2c09..c5b755514c46 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
@@ -98,6 +98,32 @@ patternProperties:
           drive-strength:
             enum: [2, 4, 6, 8, 10, 12, 14, 16]
 
+          mediatek,drive-strength-adv:
+            description: |
+              Describe the specific driving setup property.
+              For I2C pins, the existing generic driving setup can only support
+              2/4/6/8/10/12/14/16mA driving. But in specific driving setup, they
+              can support 0.125/0.25/0.5/1mA adjustment. If we enable specific
+              driving setup, the existing generic setup will be disabled.
+              The specific driving setup is controlled by E1E0EN.
+              When E1=0/E0=0, the strength is 0.125mA.
+              When E1=0/E0=1, the strength is 0.25mA.
+              When E1=1/E0=0, the strength is 0.5mA.
+              When E1=1/E0=1, the strength is 1mA.
+              EN is used to enable or disable the specific driving setup.
+              Valid arguments are described as below:
+              0: (E1, E0, EN) = (0, 0, 0)
+              1: (E1, E0, EN) = (0, 0, 1)
+              2: (E1, E0, EN) = (0, 1, 0)
+              3: (E1, E0, EN) = (0, 1, 1)
+              4: (E1, E0, EN) = (1, 0, 0)
+              5: (E1, E0, EN) = (1, 0, 1)
+              6: (E1, E0, EN) = (1, 1, 0)
+              7: (E1, E0, EN) = (1, 1, 1)
+              So the valid arguments are from 0 to 7.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
           bias-pull-down:
             oneOf:
               - type: boolean
@@ -270,4 +296,13 @@ examples:
           bias-pull-down;
         };
       };
+
+      i2c0-pins {
+        pins {
+          pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
+                   <PINMUX_GPIO9__FUNC_SCL0>;
+          bias-disable;
+          mediatek,drive-strength-adv = <7>;
+        };
+      };
     };
-- 
2.18.0